PPB to mg/kg Calculator
Trace result in PPB, report needs mg/kg — divide by 1,000. 750 PPB becomes 0.75 mg/kg.
Calculator
PPB to mg/kg Calculator
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Trace result in PPB, report needs mg/kg — divide by 1,000. 750 PPB becomes 0.75 mg/kg.
How to use this calculator
- Enter PPB.
- Divide by 1,000.
- Read mg/kg.
The formula
mg/kg = PPB ÷ 1,000
Reverse of mg/kg → PPB.
What the units mean
PPB (parts per billion) — one part per billion parts. The standard unit for trace contaminants in drinking water and environmental samples.
mg/kg — milligrams per kilogram, a mass-basis concentration. Numerically identical to PPM on a mass basis; the unit soil and food laboratories report in.
Worked example
Lab: 2,300 PPB → report: 2.3 mg/kg.
Quick reference
| PPB | mg/kg |
|---|---|
| 100 | 0.1 |
| 500 | 0.5 |
| 1,000 | 1 |
| 5,000 | 5 |
PPB ÷ 1,000 = mg/kg.
Where you will actually use this
Puts ultra-trace findings into standard soil/food report units.
- Soil reports
- Food certificates
- Environmental filings
Mistakes that give wrong answers
- Dividing by 1,000,000 instead of 1,000
Key takeaways
- Formula: mg/kg = PPB ÷ 1,000
- Remember: PPB ÷ 1,000 = mg/kg.
- Watch out for: Dividing by 1,000,000 instead of 1,000
- Next step: run your own numbers in the calculator above, then verify with a measurement — calculated values are only as good as the inputs.
Frequently asked questions
How do you convert PPB to mg/kg?
Divide by 1,000.